Some Inequalities for the Spectrum of a Matrix
Miroslav Fiedler, Vlastimil Pták (1960)
Matematicko-fyzikálny časopis
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Miroslav Fiedler, Vlastimil Pták (1960)
Matematicko-fyzikálny časopis
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Jan Kučera (1970)
Czechoslovak Mathematical Journal
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María Asunción Beitia (1986)
Extracta Mathematicae
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We study in this paper the problem of the n-square matrices X which commute with the given matrix A upon a vector subspace E of F.